Nitrate in Washington Well Water

In Washington, nitrate levels average 7.942 mg/L, with a maximum recorded level of 38.521 mg/L. The EPA limit is 10 mg/L. Currently 6.9% of tested wells exceed this limit, affecting approximately 33,120 wells.

Testing for nitrate in Washington typically costs around $115. If treatment is needed, water treatment systems for nitrate cost approximately $974.

The risk level for nitrate in Washington is rated as low. The state average of 7.942 mg/L is 83.3% above the national average of 4.332 mg/L.